Hesitation during initial acceleration,also at high speed either hesitation or missing ( 70 mph ~ 1700-2000 rpm). I have changed the plug wires,distributor cap,rotor,plugs, fuel filter,air filter,tried fuel additives nothing has helped. any ideas?
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If it only happens in one particular speed/RPM then I would be looking into TPS throttle position sensor. Please check and spray carb cleaner on the MAF mass air flow sensor only.
have you changed your fuel filter in the last year or so, if not. do it. a plugged up fuel filter will cause a lot of issues also. it can cause stalls, hesitation and stumbling.
I have a 2006 expedition with 136,000 miles and have had the transmission checked and replaced the coil wires but it still misses at 40-50 MPH and at 70 mph does the same sound. If you accelerate and back off the go again it sounds like the transmission is clunking but the transmission guy said it wasn't the transmission. HELP!!!
Is your check engine lite on.. The problem is still there at high speeds but if one cylinder is missing the piston is moving thru the problem area so fast that its not noticeable. Sounds like a vacuum leak, injecter or a bad wire or plug..*****
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